Dell OptiPlex GX240 User manual

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Dell™ OptiPlex™ GX240

SERVICE MANUAL

Notes, Notices, and Cautions

NOTE: A NOTE indicates important information that helps you make better

use of your computer.

NOTICE: A NOTICE indicates either potential damage to hardware or loss of

data and tells you how to avoid the problem.

CAUTION: A CAUTION indicates a potential for property damage,

personal injury, or death.

____________________

Information in this document is subject to change without notice.

Reproduction in any manner whatsoever without the written permission of Dell Computer

Corporation is strictly forbidden.

Trademarks used in this text: Dell, the DELL logo, and OptiPlex are trademarks of Dell Computer

Corporation.

Other trademarks and trade names may be used in this document to refer to either the entities

claiming the marks and names or their products. Dell Computer Corporation disclaims any

proprietary interest in trademarks and trade names other than its own.

September 2002 Rev. A03

Contents 3

Contents

1 Before You Begin

Getting Started . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Recommended Tools

. . . . . . . . . . . . . . . . . . . . . . . 10

Precautionary Measures

. . . . . . . . . . . . . . . . . . . . . . 10

2 Computer Cover

Opening the Computer Cover . . . . . . . . . . . . . . . . . . . 14

Closing the Computer Cover

. . . . . . . . . . . . . . . . . . . . 17

3 Inside the Computer

Key Components . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Computer Cables

. . . . . . . . . . . . . . . . . . . . . . . . . . 23

4 Battery

Removing the Battery . . . . . . . . . . . . . . . . . . . . . . . 28

Replacing the Battery

. . . . . . . . . . . . . . . . . . . . . . . 28

5 Badge

Removing the Badge . . . . . . . . . . . . . . . . . . . . . . . . 30

Small Form-Factor Computer

. . . . . . . . . . . . . . . . . . 30

Small Desktop and Small Mini-Tower Computers

. . . . . . . . 31

4 Contents

Replacing the Badge . . . . . . . . . . . . . . . . . . . . . . . . 31

Small Form-Factor Computer

. . . . . . . . . . . . . . . . . 31

Small Desktop and Small Mini-Tower Computers

. . . . . . . . 33

6 Chassis Intrusion Switch

Removing the Chassis Intrusion Switch . . . . . . . . . . . . . . 36

Replacing the Chassis Intrusion Switch

. . . . . . . . . . . . . . 38

Resetting the Chassis Intrusion Detector

. . . . . . . . . . . . . 39

Removing the Control Panel . . . . . . . . . . . . . . . . . . . . 41

Small Form-Factor Computer

. . . . . . . . . . . . . . . . . 41

Small Desktop Computer

. . . . . . . . . . . . . . . . . . . . 42

Small Mini-Tower Computer

. . . . . . . . . . . . . . . . . . 43

Replacing the Control Panel

. . . . . . . . . . . . . . . . . . . . 45

Small Form-Factor Computer

. . . . . . . . . . . . . . . . . 45

Small Desktop Computer

. . . . . . . . . . . . . . . . . . . . 47

Small Mini-Tower Computer

. . . . . . . . . . . . . . . . . . 47

7 Drives

Removing the Floppy Drive . . . . . . . . . . . . . . . . . . . . 50

Small Form-Factor Computer

. . . . . . . . . . . . . . . . . 50

Small Desktop Computer

. . . . . . . . . . . . . . . . . . . . 53

Small Mini-Tower Computer

. . . . . . . . . . . . . . . . . . 55

Replacing the Floppy Drive

. . . . . . . . . . . . . . . . . . . . 55

Small Form-Factor Computer

. . . . . . . . . . . . . . . . . 55

Small Desktop Computer

. . . . . . . . . . . . . . . . . . . . 58

Small Mini-Tower Computer

. . . . . . . . . . . . . . . . . . 59

Removing the CD/DVD Drive . . . . . . . . . . . . . . . . . . . 60

Small Form-Factor Computer

. . . . . . . . . . . . . . . . . 60

Small Desktop Computer

. . . . . . . . . . . . . . . . . . . . 62

Contents 5

Small Mini-Tower Computer . . . . . . . . . . . . . . . . . . . 64

Replacing the CD/DVD Drive

. . . . . . . . . . . . . . . . . . . . 67

Small Form-Factor Computer

. . . . . . . . . . . . . . . . . . 67

Small Desktop Computer

. . . . . . . . . . . . . . . . . . . . 69

Small Mini-Tower Computer

. . . . . . . . . . . . . . . . . . . 71

Removing the Hard Drive . . . . . . . . . . . . . . . . . . . . . . 72

Small Form-Factor Computer

. . . . . . . . . . . . . . . . . . 72

Small Desktop Computer

. . . . . . . . . . . . . . . . . . . . 74

Small Mini-Tower Computer

. . . . . . . . . . . . . . . . . . . 77

Replacing the Hard Drive

. . . . . . . . . . . . . . . . . . . . . . 79

Small Form-Factor Computer

. . . . . . . . . . . . . . . . . . 80

Small Desktop Computer

. . . . . . . . . . . . . . . . . . . . 81

Small Mini-Tower Computer

. . . . . . . . . . . . . . . . . . . 82

Adding a Second Hard Drive — Small Mini-Tower Computer

. . . 83

8 Expansion Card

Expansion Card Types . . . . . . . . . . . . . . . . . . . . . . . 88

Removing an Expansion Card

. . . . . . . . . . . . . . . . . . . 89

Small Form-Factor Computer

. . . . . . . . . . . . . . . . . . 89

Small Desktop Computer

. . . . . . . . . . . . . . . . . . . . 90

Small Mini-Tower Computer

. . . . . . . . . . . . . . . . . . . 91

Replacing an Expansion Card

. . . . . . . . . . . . . . . . . . . 92

Small Form-Factor, Desktop, and Mini-Tower Computers

. . . . 92

Removing an AGP Graphics Card

. . . . . . . . . . . . . . . . . . 96

Small Form-Factor Computer

. . . . . . . . . . . . . . . . . . 96

Small Desktop Computer

. . . . . . . . . . . . . . . . . . . . 96

Small Mini-Tower Computer

. . . . . . . . . . . . . . . . . . . 97

Replacing an AGP Graphics Card

. . . . . . . . . . . . . . . . . . 99

6 Contents

9 Expansion Card Cage (Small Desktop Computer Only)

Removing the Expansion-Card Cage . . . . . . . . . . . . . . . 102

Replacing the Expansion-Card Cage

. . . . . . . . . . . . . . . 102

Removing the PCI Riser Board

. . . . . . . . . . . . . . . . . . 103

Replacing the PCI Riser Board

. . . . . . . . . . . . . . . . . . 103

10 Front-Panel Inserts

Removing Front-Panel Inserts . . . . . . . . . . . . . . . . . . . 106

Replacing Front-Panel Inserts

. . . . . . . . . . . . . . . . . . . 110

11 I/O Panel

Removing the Front I/O Panel . . . . . . . . . . . . . . . . . . . 112

Small Form-Factor Computer

. . . . . . . . . . . . . . . . . 112

Small Desktop Computer

. . . . . . . . . . . . . . . . . . . . 113

Small Mini-Tower Computer

. . . . . . . . . . . . . . . . . . 115

Replacing the Front I/O Panel

. . . . . . . . . . . . . . . . . . . 116

12 Memory

Removing a Memory Module . . . . . . . . . . . . . . . . . . . 118

Replacing a Memory Module

. . . . . . . . . . . . . . . . . . . 118

13 Microprocessor

Removing the Cooling Fan/Heat-Sink Assembly and Microprocessor

122

Replacing the Cooling Fan/Heat-Sink Assembly and Microprocessor

.

126

Contents 7

14 Power Supply

Removing the Power Supply . . . . . . . . . . . . . . . . . . . 132

Replacing the Power Supply

. . . . . . . . . . . . . . . . . . . 135

15 System Board

System Board Components . . . . . . . . . . . . . . . . . . . . 138

Removing the System Board

. . . . . . . . . . . . . . . . . . . 141

Replacing the System Board

. . . . . . . . . . . . . . . . . . . 142

8 Contents

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SECTION 1

Before You Begin

Getting Started

Precautionary Measures

10 Before You Begin

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Getting Started

This section provides procedures for removing and replacing the

components, assemblies, and subassemblies in the Dell™ OptiPlex™

GX240 small form-factor, small desktop, and small mini-tower computers.

Unless otherwise noted, each procedure assumes that the following

conditions exist:

• You have performed the steps in "Precautionary Measures."

• You have opened the computer cover.

Recommended Tools

The GX240 computer is primarily a tool-less one, but certain procedures

(such as removing the heat sink blower or the control panel) require the use

of one or more of the following tools:

• Small flat-blade screwdriver

• #1 and #2 Phillips-head screwdrivers

• An 8-inch, #2 Phillips-head screwdriver

Also, Dell recommends that you use a wrist grounding strap as explained in

"Precautionary Measures."

Precautionary Measures

Before you perform any procedure in this section, read the following caution

for your personal safety and to prevent damage to the computer from

electrostatic discharge (ESD).

CAUTION: FOR YOUR PERSONAL SAFETY AND PROTECTION OF

THE EQUIPMENT

Before you start to work on the computer, perform the following steps in the

sequence listed:

1 Perform an orderly computer shutdown using the operating system

menu.

2 Turn off the computer and all attached devices.

Before You Begin 11

3 Disconnect the computer and devices from their AC power sources.

Also, disconnect any telephone or telecommunication lines from the

computer. Doing so reduces the potential for personal injury or shock.

If you are disconnecting a device from the computer or are removing a

component from the system board, wait 15 to 30 seconds after

disconnecting the computer from AC power before disconnecting the

device or removing the component to avoid possible damage to the

system board.

Verify that the auxiliary power light on the system board is not on. If it

is on, you may need to wait 15 to 30 seconds for it to go out (see

"System Board Components" for the location of this light).

4 Wear a wrist grounding strap, and clip it to an unpainted metal

surface, such as the padlock ring on the back of the computer. If a wrist

grounding strap is not available, touch an unpainted metal surface on

the computer, such as the power supply, to discharge static charge from

your body before touching anything inside the computer. While you

work, periodically touch an unpainted metal surface on the computer

to dissipate static electricity that might harm internal components.

In addition, take note of the following safety guideline when appropriate:

• Handle components and cards with care. Do not touch the

components or contacts on a card. Hold a card by it edges or by its

metal mounting bracket. Hold a component such as a microprocessor

by its edges, not by its pins.

12 Before You Begin

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SECTION 2

Computer Cover

Opening the Computer Cover

Closing the Computer Cover

14 Computer Cover

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Opening the Computer Cover

NOTE: If your computer

is on a stand, remove the

stand before you open the

computer cover.

Small Form-Factor Computer

1 Security cable slot

2 Padlock ring

3 Release buttons (one on each side)

3

1

2

Computer Cover 15

Small Desktop Computer

1 Padlock ring

2 Release buttons (one on each side)

2

1

16 Computer Cover

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Small Mini-Tower Computer

1

Remove the padlock from the padlock ring, if present.

NOTICE: Do not open the cover if the computer is on the edge of a desk or

table. Doing so may cause the computer to tip over and fall. Make sure that the

computer is situated so that there is at least 12 inches of desk- or table-top for

the cover to rest on.

NOTICE: Open the computer cover slowly to prevent damage to the system

cables.

2

Press in on the two securing buttons until the cover is free to swing up.

NOTICE: On the small mini-tower computer, to prevent damage to the system

board, open the cover until it catches at a 45-degree angle. Then remove the

drive data cables from the system board and open the cover to a 90-degree

angle.

1 Padlock ring

2 Release buttons (one on each side)

2

1

Computer Cover 17

Closing the Computer Cover

1 Check all cable connections, especially those that might have come

loose during your work. Fold cables out of the way so that they do not

catch on the computer cover. Make sure cables are not routed over the

drive cage—they will prevent the cover from closing properly.

2 Check to see that no tools or extra parts (including screws) are left

inside the computer.

3 On the small mini-tower computer, close the cover to a 45-degree

angle and connect the drive data cables to the system board.

4 Close the computer cover by pivoting the cover down toward the back

of the computer and into position. Make sure that the securing

buttons click into place.

5 Replace the padlock, if required.

NOTE: After you open and close the cover, the chassis intrusion detector

causes the following message to be displayed at the next computer start-

up:

ALERT! Cover was previously removed.

See "Resetting the Chassis Intrusion Detector" for instructions.

18 Computer Cover

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SECTION 3

Inside the Computer

Key Components

Computer Cables

20 Inside the Computer

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Key Components

NOTE: User service

access points are color-

coded green.

Small Form-Factor Computer

1 Hard drive 7 System board

2 3.5-inch floppy drive 8 Power supply

3 CD/DVD drive 9 AC power connector

4 Cover release buttons (2) 10 I/O ports and connectors

5 Internal speaker 11 Padlock ring

6 Chassis intrusion switch 12 Heat sink and blower assembly

2

1

3

5

6

7

9

8

10

11

12

4

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